Exhibit 99.3

                                POWER OF ATTORNEY


Power of Attorney, dated as of January 7, 2002 for Waddell & Reed Financial
Services, Inc. filed as Exhibit 3 to the Waddell & Reed Financial, Inc. 13G/A
filed for Impath, Inc. on August 8, 2002, Accession Number 0000912057-02-030447
and incorporated herein by reference.

Power of Attorney, dated as of January 7, 2002 for Waddell & Reed, Inc. filed as
Exhibit 3 to the Waddell & Reed Financial, Inc. 13G/A filed for Impath, Inc. on
August 8, 2002, Accession Number 0000912057-02-030447 and incorporated herein by
reference.

Power of Attorney, dated as of January 7, 2002 for Waddell & Reed Investment
Management Company Financial Services, Inc. filed as Exhibit 3 to the Waddell &
Reed Financial, Inc. 13G/A filed for Impath, Inc. on August 8, 2002, Accession
Number 0000912057-02-030447 and incorporated herein by reference.